The Father of Stainless Steel

Many great inventions in life come from complete mistake or accident, the world of metal is no stranger to this effect. The most popular and widely used stainless steel is one of the best examples to this outcome. Although at first intended to perfect a gun, this metal went on to change the world for ever. Throughout time, metallurgists-individuals who study the physical and chemical aspect of metal were stuck on the problem of rusting. Ironically the discovery of stainless steel came in form of a gun.

image

The story goes, that in 1912 a metallurgist by the name of Harry Brearly from Sheffield was trying to improve the then used pistol to make it better. Most gun barrels are grooved – or “rifled” – in a spiral pattern that causes the bullet to spin, increasing accuracy. But the friction between the bullet and the barrel causes wear, eventually making the barrel too big for the bullet. Brearley wanted to develop a steel alloy that would resist erosion.

image

The story continues after several months of trial and error he began to collect a massive pile of steel scraps. One day Brearly noticed that one of his failed scrap was still shiny and maintained its structure while those around it had rusted. This at the time “failed” scrap contained about 12% chromium unknowingly had reacted with the oxygen in the air to form a thin protective cover. At the time Brearly dubbed his invention “rustless steel”.

image

Since Brearly hometown was known for manufacturing cutlery, he immediately saw an opportunity to test his new invention. He met up with an old schoolmate by the name of Ernest Stuart who at the time was a manager at Mosley’s Portland Works. After a serious of test, Stuart named it “stainless steel”-since then the name never changed. It is incredible to think today how we could live without the assistance of stainless steel. It’s everywhere we look, hell it’s holding the very chair I’m sitting on right now.

image

Here at Shanghai Metal Corporation we have taken this valuable and important invention and given it different applications. From sheets to pipes, and everything in between, we here at SMC will have the answer to your stainless steel needs. For more information on stainless steel material please visit our website. Be sure to join the conversation in our Linkedin group, Facebook, Twitter, and Instagram account. You can also try our new mobile application by scanning the below QR code with your tablet or smart phone.

Mario B.//SMC Editor

image

#BuildingValueAcrossTheGlobe

Sources: Wikipedia Accident , SMC

Photo credit: flickr.com

铁矿石简介-较于碳钢

凡是含有可经济利用的铁元素的矿石叫做铁矿石。铁矿石的种类很多,用于炼铁的主要有磁铁矿(Fe3O4)、赤铁矿(Fe2O3)和菱铁矿(FeCO3)等。铁矿石试样经盐酸溶解后,其中的铁转化为Fe3+。在强酸性条件下,Fe3+可通过SnCl2还原为Fe2+。Sn2+将Fe3+还原完毕后,甲基橙也可被Sn2+还原成氢化甲基橙而褪色,因而甲基橙可指示Fe3+还原终点。

铁矿石是国际大宗商品,战略物资,属于经济命脉一类的东西。世界铁矿资源集中在澳大利亚、巴西、俄罗斯、乌克兰、哈萨克斯坦、印度、美国、加拿大、南非等国。中国作为世界上最大的铁矿石需求国,自身的铁矿石储量虽然不算少,但品质不幸比较低,从工业经济的角度来讲,倒不如从盛产富铁矿的澳大利亚、巴西等国进口。

可以直接投入炼钢炉炼钢的铁矿石旧称“平炉富矿”,可以直接用于炼铁的铁矿石旧称“高炉富矿”,都带个“富”字。这些富矿一般是磁铁矿和赤铁矿,它们的含铁量都在70%以上。

贫矿,或者是有害杂质较多的铁矿,则需要先经过选矿,成本一下子就上去了。铁矿石的分类十分复杂,可以按主要成分、有害杂质、结构形态、脉石种类等许多角度来分,每种角度都能分出许多种,工业上选用哪一种,对应于什么样的工艺流程,有非常多的讲究,是一门很大的学问。

分类

磁铁矿

磁铁矿

是一种氧化铁的矿石,主要成份为Fe3O4,是Fe2O3和FeO的复合物,呈黑灰色,含Fe72.4%,O27.6%,具有磁性。在选矿时可利用磁选法,处理非常方便;但是由于其结构细密,故被还原性较差。经过长期风化作用后即变成赤铁矿。

赤铁矿

赤铁矿

也是一种氧化铁的矿石,主要成份为Fe2O3,呈暗红色,比重大约为5.26,含Fe70%,O 30%,是最主要的铁矿石。由其本身结构状况的不同又可分成很多类别,如赤色赤铁矿、镜铁矿、云母铁矿、粘土质赤铁等。

褐铁矿

褐铁矿    这是含有氢氧化铁的矿石。它是针铁矿  HFeO2和鳞铁矿FeO(OH)两种不同结构矿石的统称,呈现土黄或棕色,含有Fe约62%,O 27%,H2O 11%,多半是附存在其它铁矿石之中。

铁相对于碳钢,含碳量高出很多,但是在很多特性上,例如韧性上碳钢要胜出一筹。在名佳利,我们提供多种多样的碳钢产品,包括基本的钢板,钢管,覆铜钢带,甚至还有锅炉板等产品。我们能满足您的需求,让您充分体会到一站式采购的快感。

Andrew G.//SMC Editor